#Copyright (c) 2009 Roman Savelyev
#
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.

use strict;
use Fcntl;

my @crctable = (
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
);

sub crc32ccitt
{
	my $data = shift;
	my $crc = 0;
	for my $c (unpack "C*", $data)
	{
		$crc = ($crc>>8)^$crctable[($c^$crc)&0xff];
	}
	return $crc;
}

my @supportedcapabilities =
(
    "TCB", "CommDD", "PowerMgmt", "MultimediaDD", "ReadDeviceData",
    "WriteDeviceData", "DRM", "TrustedUI", "ProtServ", "DiskAdmin",
    "NetworkControl", "AllFiles", "SwEvent", "NetworkServices",
    "LocalServices", "ReadUserData", "WriteUserData", "Location",
    "SurroundingsDD", "UserEnvironment"
);

my $indent = "      ";

my $dump = '';
my $help = '';
my $info = '';

foreach (@ARGV)
{
    $dump = 1 if $_ eq '-d';
    $help = 1 if $_ eq '-h';
    $info = 1 if $_ eq '-i';
}

sub help
{
    print "CaPatch v. 1.0\n";
    print "Dumps or modifies capabilities of E32-format binaries\n";
    print "\n";
    print "capatch.pl -d path_to_binary\n";
    print "capatch.pl -h\n";
    print "capatch.pl path_to_binary list new capabilities\n";
    print "capatch.pl -i capability_name\n";
    print "\n";
    print "Command line arguments:\n";
    print "      -d    Dumps existing capablities set for binary\n";
    print "      -i    Prints some information about specified capability\n";
    print "      -h    Prints this message\n";
    print "\n";
    print "Example usage:\n";
    print "capatch.pl -d mybinary.exe\n";
    print "      List capabilities currently set for mybinary.exe\n";
    print "capatch.pl mybinary.exe All\n";
    print "      Sets all possible capabilities for mybinary.exe\n";
    print "capatch.pl mybinary.exe +AllFiles\n";
    print "      Adds AllFiles capability for mybinary.exe\n";
    print "capatch.pl mybinary.exe -AllFiles\n";
    print "      Removes AllFiles capability from mybinary.exe\n";
    print "capatch.pl mybinary.exe All -TCB\n";
    print "      Sets all possible capabilities except TCB for mybinary.exe\n";
    print "capatch.pl mybinary.exe None\n";
    print "      Removes all capabilities from mybinary.exe\n";
    print "\n";
    print "Currently supported capabilities:\n";
    my $line = $indent;
    foreach (@supportedcapabilities)
    {
        if (length($line) + length($_) > 70)
        {
            print "$line\n";
            $line = $indent;
        }
        $line .= "$_ ";
    }
    print "$line\n" if (length($line) > length($indent));
}

sub readcapabilities
{
    my $file = shift;
    open FILE, "<$file" or die "Could not open $file for reading: $!";
    binmode FILE;
    seek FILE, 0x88, 0;
    my $capabilities;
    sysread FILE, $capabilities, 8;
    close FILE;
    my $capset = unpack("b64", $capabilities);
    my %caphash;
    for (my $i=0; $capset =~ m/^.{$i}(.)/; $i++)
    {
        $caphash{$supportedcapabilities[$i]} = 1 if ($1 == 1);
    }
    return %caphash;
}

sub iscapabilitysupported
{
    my $cap = shift;
    foreach (@supportedcapabilities)
    {
        return 1 if $cap eq $_;
    }
    return 0;
}

if ($help)
{
    help();
}
elsif ($info)
{
    my %capinfo;
    #### TCB info
    $capinfo{'TCB'} .= "Grants write access to executables and shared read-only resources.\n";
    $capinfo{'TCB'} .= "\n";
    $capinfo{'TCB'} .= "This is the most critical capability as it grants access to\n";
    $capinfo{'TCB'} .= "executables and therefore to their capabilities. It also grants write\n";
    $capinfo{'TCB'} .= "access to the /sys and /resource directories.\n";
    ### CommDD info
    $capinfo{'CommDD'} .= "Grants direct access to all communication device drivers. This\n";
    $capinfo{'CommDD'} .= "includes: the EComm, Ethernet, USB device drivers etc.\n";
    ### PowerMgmt info
    $capinfo{'PowerMgmt'} .= "Grants the right:\n";
    $capinfo{'PowerMgmt'} .= "\n";
    $capinfo{'PowerMgmt'} .= "    - to kill any process in the system\n";
    $capinfo{'PowerMgmt'} .= "    - to power off unused peripherals\n";
    $capinfo{'PowerMgmt'} .= "    - to switch the machine into standby state\n";
    $capinfo{'PowerMgmt'} .= "    - to wake the machine up\n";
    $capinfo{'PowerMgmt'} .= "    - to power the machine down completely.\n";
    $capinfo{'PowerMgmt'} .= "\n";
    $capinfo{'PowerMgmt'} .= "Note that this does not control access to anything and everything\n";
    $capinfo{'PowerMgmt'} .= "that might drain battery power.\n";
    ### MultimediaDD info
    $capinfo{'MultimediaDD'} .= "Grants direct access to all multimedia device drivers.\n";
    $capinfo{'MultimediaDD'} .= "This includes the sound, camera, video device drivers etc.\n";
    ### ReadDeviceData info
    $capinfo{'ReadDeviceData'} .= "Grants read access to network operator, phone manufacturer and device\n";
    $capinfo{'ReadDeviceData'} .= "confidential settings or data.\n";
    $capinfo{'ReadDeviceData'} .= "\n";
    $capinfo{'ReadDeviceData'} .= "For example, the pin lock code, the list of applications that are\n";
    $capinfo{'ReadDeviceData'} .= "installed.\n";
    ### WriteDeviceData info
    $capinfo{'WriteDeviceData'} .= "Grants write access to settings that control the behaviour of the\n";
    $capinfo{'WriteDeviceData'} .= "device.\n";
    $capinfo{'WriteDeviceData'} .= "\n";
    $capinfo{'WriteDeviceData'} .= "For example, device lock settings, system time, time zone, alarms,\n";
    $capinfo{'WriteDeviceData'} .= "etc.\n";
    ### DRM info
    $capinfo{'DRM'} .= "Grants access to protected content.\n";
    $capinfo{'DRM'} .= "\n";
    $capinfo{'DRM'} .= "DRM (Digital Rights Management) agents use this capability to decide\n";
    $capinfo{'DRM'} .= "whether or not an application should have access to DRM content.\n";
    $capinfo{'DRM'} .= "Applications granted DRM are trusted to respect the rights associated\n";
    $capinfo{'DRM'} .= "with the content.\n";
    ### TrustedUI info
    $capinfo{'TrustedUI'} .= "Grants the right to create a trusted UI session, and therefore to\n";
    $capinfo{'TrustedUI'} .= "display dialogs in a secure UI environment.\n";
    $capinfo{'TrustedUI'} .= "\n";
    $capinfo{'TrustedUI'} .= "Trusted UI dialogs are rare. They must be used only when\n";
    $capinfo{'TrustedUI'} .= "confidentiality and security are critical; for example, for password\n";
    $capinfo{'TrustedUI'} .= "dialogs.\n";
    $capinfo{'TrustedUI'} .= "\n";
    $capinfo{'TrustedUI'} .= "Normal access to the user interface and the screen does not require\n";
    $capinfo{'TrustedUI'} .= "this capability.\n";
    ### ProtServ info
    $capinfo{'ProtServ'} .= "Grants the right to a server to register with a protected name.\n";
    $capinfo{'ProtServ'} .= "\n";
    $capinfo{'ProtServ'} .= "Currently, protected names start with a \"!\" character. The kernel\n";
    $capinfo{'ProtServ'} .= "prevents servers without this capability from using such a name, and\n";
    $capinfo{'ProtServ'} .= "therefore prevents protected servers from being impersonated.\n";
    ### DiskAdmin info
    $capinfo{'DiskAdmin'} .= "Grants access to disk administration operations that affect more than\n";
    $capinfo{'DiskAdmin'} .= "one file or one directory (or overall filesystem integrity/behaviour,\n";
    $capinfo{'DiskAdmin'} .= "etc).\n";
    $capinfo{'DiskAdmin'} .= "\n";
    $capinfo{'DiskAdmin'} .= "For examples, reformatting a disk partition.\n";
    ### NetworkControl info
    $capinfo{'NetworkControl'} .= "Grants the right to modify or access network protocol controls.\n";
    $capinfo{'NetworkControl'} .= "\n";
    $capinfo{'NetworkControl'} .= "Typically when an action can change the behaviour of all existing and\n";
    $capinfo{'NetworkControl'} .= "future connections, it should be protected by this capability.\n";
    $capinfo{'NetworkControl'} .= "\n";
    $capinfo{'NetworkControl'} .= "For example, forcing all existing connections on a specific protocol\n";
    $capinfo{'NetworkControl'} .= "to be dropped, or changing the priority of a call.\n";
    ### AllFiles info
    $capinfo{'AllFiles'} .= "Grants read access to the entire file system; grants write access to\n";
    $capinfo{'AllFiles'} .= "the private directories of other processes.\n";
    $capinfo{'AllFiles'} .= "\n";
    $capinfo{'AllFiles'} .= "This capability is very strictly controlled and should rarely be\n";
    $capinfo{'AllFiles'} .= "granted.\n";
    ### SwEvent info
    $capinfo{'SwEvent'} .= "Grants the right to generate software key & pen events, and to\n";
    $capinfo{'SwEvent'} .= "capture any of them regardless of the status of the application.\n";
    $capinfo{'SwEvent'} .= "\n";
    $capinfo{'SwEvent'} .= "Note that after obtaining the focus, normal applications do not need\n";
    $capinfo{'SwEvent'} .= "this capability to be dispatched key and pen events.\n";
    ### NetworkServices info
    $capinfo{'NetworkServices'} .= "A user capability that grants access to remote services without any\n";
    $capinfo{'NetworkServices'} .= "restriction on its physical location.\n";
    $capinfo{'NetworkServices'} .= "\n";
    $capinfo{'NetworkServices'} .= "Typically, such a location is unknown to the phone user, and such\n";
    $capinfo{'NetworkServices'} .= "services may incur cost for the phone user.\n";
    $capinfo{'NetworkServices'} .= "\n";
    $capinfo{'NetworkServices'} .= "Voice calls, SMS, and internet services are good examples of\n";
    $capinfo{'NetworkServices'} .= "such network services. They are supported by GSM, CDMA and all IP\n";
    $capinfo{'NetworkServices'} .= "transport protocols including Bluetooth profiles over IP.\n";
    ### LocalServices info
    $capinfo{'LocalServices'} .= "A user capability that grants access to remote services in the close\n";
    $capinfo{'LocalServices'} .= "vicinity of the phone.\n";
    $capinfo{'LocalServices'} .= "\n";
    $capinfo{'LocalServices'} .= "The location of the remote service is well-known to the phone user,\n";
    $capinfo{'LocalServices'} .= "and in most cases, such services will not incur cost for the phone \n";
    $capinfo{'LocalServices'} .= "user.\n";
    ### ReadUserData info
    $capinfo{'ReadUserData'} .= "A user capability that grants read access to data that is\n";
    $capinfo{'ReadUserData'} .= "confidential to the phone user.\n";
    $capinfo{'ReadUserData'} .= "\n";
    $capinfo{'ReadUserData'} .= "This capability supports the management of the user\'s privacy.\n";
    $capinfo{'ReadUserData'} .= "\n";
    $capinfo{'ReadUserData'} .= "Typically, contacts, messages and appointments are always seen user\n";
    $capinfo{'ReadUserData'} .= "confidential data.\n";
    ### WriteUserData info
    $capinfo{'WriteUserData'} .= "A user capability that grants write access to user data.\n";
    $capinfo{'WriteUserData'} .= "\n";
    $capinfo{'WriteUserData'} .= "This capability supports the management of the integrity of user\n";
    $capinfo{'WriteUserData'} .= "data.\n";
    $capinfo{'WriteUserData'} .= "\n";
    $capinfo{'WriteUserData'} .= "Note that this capability is not symmetric with the\n";
    $capinfo{'WriteUserData'} .= "ECapabilityReadUserData capability. For example, you may want to\n";
    $capinfo{'WriteUserData'} .= "prevent rogue applications from deleting music tracks but you may not\n";
    $capinfo{'WriteUserData'} .= "want to restrict read access to them.\n";
    ### Location info
    $capinfo{'Location'} .= "A user capability that grants access to the location of the device.\n";
    $capinfo{'Location'} .= "\n";
    $capinfo{'Location'} .= "This capability supports the management of the user\'s privacy with\n";
    $capinfo{'Location'} .= "regard to the phone location.\n";
    ### SurroundingsDD info
    $capinfo{'SurroundingsDD'} .= "Grants access to logical device drivers that provide input\n";
    $capinfo{'SurroundingsDD'} .= "information about the surroundings of the device.\n";
    $capinfo{'SurroundingsDD'} .= "\n";
    $capinfo{'SurroundingsDD'} .= "Good examples of drivers that require this capability would be GPS\n";
    $capinfo{'SurroundingsDD'} .= "and biometrics device drivers. For complex multimedia logical device\n";
    $capinfo{'SurroundingsDD'} .= "drivers that provide both input and output functions, such as Sound\n";
    $capinfo{'SurroundingsDD'} .= "device driver, the  MultimediaDD capability should be used if it is\n";
    $capinfo{'SurroundingsDD'} .= "too difficult to separate the input from the output calls at its API\n";
    $capinfo{'SurroundingsDD'} .= "level.\n";
    ### UserEnvironment info
    $capinfo{'UserEnvironment'} .= "Grants access to live confidential information about the user and\n";
    $capinfo{'UserEnvironment'} .= "his/her immediate environment. This capability protect the user\'s\n";
    $capinfo{'UserEnvironment'} .= "privacy.\n";
    $capinfo{'UserEnvironment'} .= "\n";
    $capinfo{'UserEnvironment'} .= "Examples are audio, picture and video recording, biometrics (such as\n";
    $capinfo{'UserEnvironment'} .= "blood pressure) recording.\n";
    $capinfo{'UserEnvironment'} .= "\n";
    $capinfo{'UserEnvironment'} .= "Please note that the location of the device is excluded from this \n";
    $capinfo{'UserEnvironment'} .= "capability. The protection of this is achieved by using the dedicated\n";
    $capinfo{'UserEnvironment'} .= "capability Location\n";
    ### All info
    $capinfo{'All'} .= "Listing information for multiple capabilities is not supported.\n";
    $capinfo{'All'} .= "Please specify single capability you want to get informed about.\n";
    ### None info
    $capinfo{'None'} .= "No capabilities specified to provide information about. Please name\n";
    $capinfo{'None'} .= "single capability to print its description.\n";
    ### Unknown capability
    $capinfo{'UNKNOWN'} .= "The capability you requested either does not exist or not supported\n";
    $capinfo{'UNKNOWN'} .= "by this version of CaPatch. Read help to find the list of\n";
    $capinfo{'UNKNOWN'} .= "capabilities which you can get information on.\n";
    my $capability = pop @ARGV;
    $capability = 'UNKNOWN' unless defined $capinfo{$capability};
    print $capinfo{$capability};
}
elsif ($dump)
{ ### dumping
    my $binary = pop @ARGV;
    my %capabilities = readcapabilities $binary;
    print "CAPABILITY";
    my @caplist = keys %capabilities;
    foreach (@caplist)
    {
        print " $_";
    }
	print " None" if $#caplist == -1;
    print "\n";
    if ($#caplist >= $#supportedcapabilities-3)
    {
        #build alternative form "All -XXX"
        print "CAPABILITY All";
        foreach (@supportedcapabilities)
        {
            print " -$_" unless defined $capabilities{$_};
        }
        print "\n";
    }
}
elsif ($#ARGV > 0)
{ ### patching
    my $binary = shift;
    my %capabilities = readcapabilities $binary;
    my $firstset = 0;
    foreach (@ARGV)
    {
        if (m/\-(.+)/)
        {
            delete $capabilities{$1};
        }
        elsif (m/\+(.+)/)
        {
            $capabilities{$1} = 1 if iscapabilitysupported($1);
        }
        elsif (/(.+)/)
        {
            if (iscapabilitysupported($1))
            {
                if (!$firstset)
                {
                    delete $capabilities{$_} foreach keys %capabilities;
                    $firstset = 1;
                }
                $capabilities{$1} = 1;
            }
            elsif ($1 eq 'All')
            {
                $capabilities{$_} = 1 foreach @supportedcapabilities;
                $firstset = 1;
            }
            elsif ($1 eq 'None')
            {
                delete $capabilities{$_} foreach keys %capabilities;
                $firstset = 1;
            }
        }
    }
    my $capstring = "";
    for my $i (0..63)
    {
        $capstring .= exists ($capabilities{$supportedcapabilities[$i]}) ? '1' : '0';
    }
    sysopen FILE, "$binary", O_RDWR or die "Could not open $binary for writing: $!";
    binmode FILE;
	my $headersizenative;
	seek FILE, 0x64, 0;
	sysread FILE, $headersizenative, 0x4;
	my $headersize = unpack "I", $headersizenative;
	my $header;
	seek FILE, 0x0, 0;
	sysread FILE, $header, $headersize;
	my $newheader = "";
	$newheader .= substr $header, 0, 0x14;
	$newheader .= pack "I", 0xc90fdaa2;
	$newheader .= substr $header, 0x18, 0x88-0x18;
	$newheader .= pack "b64", $capstring;
	$newheader .= substr $header, 0x90, $headersize-0x90;
	my $crc = crc32ccitt $newheader;
	my $headertowrite = "";
	$headertowrite .= substr $newheader, 0, 0x14;
	$headertowrite .= pack "I", $crc;
	$headertowrite .= substr $newheader, 0x18, $headersize-0x18;
    seek FILE, 0, 0;
    syswrite FILE, $headertowrite, $headersize;	
    close FILE;
    print "CAPABILITY";
	my @capkeys = keys %capabilities;
    print " $_" foreach (@capkeys);
	print " None" if $#capkeys == -1;
    print "\n";
}
else
{
    help();
}